diff options
| author | Nicholas Piggin <[email protected]> | 2020-11-11 22:01:51 +1000 |
|---|---|---|
| committer | Michael Ellerman <[email protected]> | 2020-11-19 16:56:52 +1100 |
| commit | 987c426320cce72d1b28f55c8603b239e4f7187c (patch) | |
| tree | b1e9572df774b1b1c48091285984b81b9be874d2 /tools/perf/scripts/python/bin/stackcollapse-record | |
| parent | fdcfeaba38e5b183045f5b079af94f97658eabe6 (diff) | |
powerpc/64s/perf: perf interrupt does not have to get_user_pages to access user memory
read_user_stack_slow that walks user address translation by hand is
only required on hash, because a hash fault can not be serviced from
"NMI" context (to avoid re-entering the hash code) so the user stack
can be mapped into Linux page tables but not accessible by the CPU.
Radix MMU mode does not have this restriction. A page fault failure
would indicate the page is not accessible via get_user_pages either,
so avoid this on radix.
Signed-off-by: Nicholas Piggin <[email protected]>
Signed-off-by: Michael Ellerman <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Diffstat (limited to 'tools/perf/scripts/python/bin/stackcollapse-record')
0 files changed, 0 insertions, 0 deletions